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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '71681c16358c817e02d6ba416b7e4e80efdbc5035700f7eeaa98fe5e61acd57a' 
  AND token = 'Ph8lgX0AonVuoorkuQigqKi5GppQl38iFHI7CpnwOdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}