Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9743bd3f1c928d18476380e3538d95e8d5c76e0ec0e91ca40b89a76c7791af4c' 
  AND token = 'mhlEP7vUd59oJgt1tUhYLOwvNFD0QyHuxLh2eUavT7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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