Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a8ecaf3ffad578b447b4068cb778eed7f9fc67a4c4884229dacde1bfdbb1346' 
  AND token = 'cI++xHAS9h2BdbRELAujcJ8n9HaNFMQMCia59oyxEEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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