Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d9b4f5b29c0b2b7a756f61befbb1f23ba8e68c39f9e2a33cd819fc0c92341a' 
  AND token = 's2d6IeUouoVAvjTLGZKA0jdihY2aUn0v0pR3IuUMwWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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