SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9217f728c06ef89cc4f4459a86a705e5ace9896583cd2ef2a5df920e6bc4dc74' 
  AND token = 'NHVMhvUM46YTFJDF+RyMY4xKxY2CQX+HpHH16gK9oDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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