Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b594c1823bfe4d86c81c7393bba98fd35d30af9c3dea7facc90bfff1d2c3908' 
  AND token = 'gZ4oCTsfcspZL4RFNsbJWANpn4wYd6LM2XvMqH9Engc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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