Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc36b8af1b901b28377bfe3fc0c558c1a1209a0d50b221943a6b5f86f69631b2' 
  AND token = '4u2v8JdSM0nGQJ2Im/10l0vQJa3ib7nKb1ZYZrHa9Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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