Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a02cd5833b3c2684a3307c2baca580ba50fc5cde6d84e3b8bc6c070b2b5bd37' 
  AND token = 'JWB72TGIcmqLpEExMNkSSfPerZT+oxkgOCeQ9NLwDWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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