Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b0e2e0f5eb226162e0d35b1381c3d7ff636326e5c807c00a8c80db93ba11325' 
  AND token = 'V9Itba9ogdSBHI3ladCvWyihw+GGNMD/PBmeWyqQ3e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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