Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43263922b58b0ac4dc258cd3e350409ee5b5f163ccd1431c72a29d9e4d90764d' 
  AND token = 'UZjceuOMHOg6ZmDsUWOA+kqFPgmwkf8rIR81elzRL54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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