Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddeb27dfa768bbd690f526617c2ffef52b8541e9257661b97ff7b8ec2755b52c' 
  AND token = 'e/FCZX1XY5oby5/fw71cv33BZ3CdZOGk4mNvH41sBmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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