Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c68bf512012e462650d48c90f791d33293b3d16104d0a1891c8096f6a31c29fe' 
  AND token = 'C/GW2Clqx9WQS49LfgGVwnyEfik4pytH+ov12Fc/boQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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