SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4acab425741d0b83c61843cf3ad97ef328569f5d383a6e8c57f776682e453e50' 
  AND token = 'EWPdAFz6lAFrQmheFxYrXk8vCKojPI7bHGEsQpOEg4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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