Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d18a231213cada2fc1d7f64f8a26f14eae2877f6fdd05a6c728a23a4610838' 
  AND token = 'CFr2wP/ZMiPCttlJss3uHEoh+21kVyCwOcSbI7odOGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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