Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c1d832af22a1abb0ee8d3855cabac193f82d23f21629fc8d86714413b49ac2' 
  AND token = 'MYgYeLJWEGTnVXUIkxBgJ+b6YvLiRENXIfNLJ9DTGSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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