Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff823317ca40145364d680ab6fba4fa7ad1a82d7b314a4fccc4311093fd82aa6' 
  AND token = 'K0j/OCTCiUB6vooL5lD3uxq9eHWVgYtogv6AKccMI2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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