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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '495c0b40cbacc4be2a3e39e9fc55958e2067423b6209c24b15a2e298c396327c' 
  AND token = 'XMDS/SVPVw1rIIpRcmdnLUdkHkf73keAtn367uEEVg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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