Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37e256b1d084690db60dd83c504a15bcc889c57fda8715583f624ad4ee1b0eb0' 
  AND token = 'wbNFyxXaNWTDQyTdYRj2LQh/d/gxyoJvzgcSSfMVLRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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