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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'd939a41426aab6308e7c7a578099ee5f567329779374a2e68d57deec567f19cb' 
  AND token = 'LCeMj7UdKcXLhSIDOe4F/sMt0AEy1NFFt3XoQ99+p4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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