Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d972f7ba4c25986aba010db225a5d0e32496e15bcd723724d55e4a90e9cde7' 
  AND token = 'G5tdnHeExnpx55ozf4vFn/Ot2rVEGw1fDOmBaCb66lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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