Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b86d03d7b5ea4fccd509deebdd881a0cb5a96b4422d7e7294d0e54e5426732' 
  AND token = 'u3wIziuZVvCYnYDdHGED1NL+ATL4cJHmR/NrJU9CQAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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