Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bcee0c2ff091bacbb6c79c8563a879fc6718d3c49dd15b9c38499ed13cd5b8b' 
  AND token = 'fmUfeoKQ5mr7xEhK6pz6NpoRvumTLQIlSqh+SC/9ejY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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