Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '188d876adb74b478b4684ce67d34a3a0d297a27e87c6a2fcdac356e18a350619' 
  AND token = 'fFT3r66OYEAc1QdtPgW0vTf8HfjhM1SHVMPXVRKQo14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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