Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87ff0e0b5bd1db918dfb00cdd97e8c1b456352e8b9b8e0cb9c2c82507b668c78' 
  AND token = 'cRjS+EwEMwXPitaM1LlBZRA0Y5F85Y0kd9Vo6RNtzw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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