Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e574263be8893b5e74c5d700135aec7596ad2f2f95515c17c26b155efbfaafe2' 
  AND token = 'zwyOZ9olhlFy7nwDrKUs5l2eRw+75QGpDZ6ymrWmrmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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