Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f6c917d3bb28054f000eda7d37cb0865d41933aa7226167ee56774e8aee0903' 
  AND token = 'FmWJgjmH4VCAtUcaY2E2wDm82v3wflSo/1YXjYTpgt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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