Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e52657ba7c8de3541f145f958a124979213f670345848baa4ecf74b498bc5bf' 
  AND token = '7lnUthwQkR0e9LipueUmKFc6HbxjUGdyYFNuA8m3vzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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