Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0d4dfebfa353723e29c7c840c46717225e43dddf2526ca9c779b2caffc53f51' 
  AND token = 'r9t9mMy8JPMCQ7GDokwUDPXUL16lRXBdXVzEhoMM05o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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