Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd7e63e823059fb840f9cbe1c46f015aa1b2b097cf9c196d040d789f84ba002b' 
  AND token = 'NS6kreqn/Ko4RbWyBdT7ForrZB+6IdqzRxHAJmtjHbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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