Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '632ba7c4881519040903c16dd82aade2eecec01de4ad3230dc1cfc93cf268b91' 
  AND token = 'BNRet2HHKhE+Ui6l2CCfJ4t2JMf6Z99i6GAul9b+OyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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