Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a76ac0bcb6bb413110541bf6cfc50e129f0fbfa946f99a9aebb5a03c7eea1bd' 
  AND token = 'mg3/akzqjpfcQkGpaybkFg/x4U2tvlSrFKwpnJmHnrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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