Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ad5213dbb4eb3a904b6c4d82692a5f424c4849d1e1def9a2b87a9c1fb25f3f' 
  AND token = 'sfRqWeaYnlQC+LMsnzK9EYzq5kXfWNjHGPBLHSWb50s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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