Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '187935ec38d18de4c59747e1a3ff6c7a810f8bbacffb61d03a003b47bc955d88' 
  AND token = 'YlQl8APgNSuM9MsMtB0fWSl6ThbncnVFgNohJhZPSzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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