Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae7817afb44ece6aebf94f75e305c1ac4dbf3a9607ddb05c2a2fe861e4f90b7' 
  AND token = 'lEuKQaV/vQiTmRpKq3WbShxnY0JUopdADqaLeipd9rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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