Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a09302d6aa0095e63b76b6f19283c200e6ceeb626dc3328bc469d8a3dba0646' 
  AND token = 'RboRvgcpDS3PXCcYoSODif/ee849bFn6eXdHU5rdAJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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