Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf79bcd8a5f1b394312627b571f906d0137e057c3ce32ed82d5f9912c2f0245' 
  AND token = 'K0prUpxsI9UGjZ6RHuImQZWXya8wnN/D47SK2xMg/rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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