Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf7787511de7db56dfb6e14e1f9593234f9c3f9ccc0c8d2c3dfdf70960ce06e' 
  AND token = 'CtljnfoCrFWZE6G1nQQE5DOgdVEcMgQIyaWnFiK6+2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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