Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a5fbf4facf8b1c537dcb07b82957f1c77827f7cddfd016a9a8bb71c68aabfc3' 
  AND token = 'Ie8+Dqg5ZW9yaWYVEjp9UpJf1ply/eiAO3G9YzKOwVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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