Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5940444c37b41c0a7ef6ba04f8d79a4a9e8b862feff6a4df90afe82f52de9b0a' 
  AND token = 'uqe7OLYv2V9JXvmrR/z1JXKXv0wJNXsAeK67DMj0a1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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