Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86d8d42d584e085ca8c8b99e6308eec050e4280018bae21d297b2b92d49ea2cc' 
  AND token = 'aiq+B/GEwizHSgVqf1dvw56KAUore9DOqCgpImMq96k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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