Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42de679b5dfe4ccb2a054ffb15079a93e7abe72f3f0a1ed5655b7b617534839c' 
  AND token = 'tL6ZFo2ouHYNkM3JuHqnJqw27IHtIu2GmdSu4Ae/meU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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