Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '509e3e9cab9ad2594f68d8273fd11059e5c4ea046200d41bb8c0fdada4bcbb16' 
  AND token = 'BNpXHAEvV15W9uawJCumwEp12sH7Jfb674tOSsQGzM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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