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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f9caf81a5bdd11fde126dd7819475aa942ece4c32d0a3a5dabfef656b59adad7' 
  AND token = 'WsUpx4D/qfnXFYdvmWUc0JenlJaxHJoYA7rpWPKijyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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