Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4ca79f0aaa79d2483d0f70cc5b574c74fb3da9db39816fecc03bc9facc39dbb' 
  AND token = 'kGMIftWCb+q7zstOkgs7G3XNEmxVxvxVOTpm9fUp3po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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