Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c5b5dd14824cdd9c2bd9e17ff54577b94d15c24f4d0a140f0ba6840e667261' 
  AND token = 'QqRP4r9egMRbNx8yCW5XufzXYdTpjSXVhUn7+sbLhvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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