SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd14677adcf9894faf1963551be3d5c4126fd273b5b1ca78a1569291ed28719fe' 
  AND token = 'I0VbOynvBXeMUNaevo+lgBuXOw+gJhsU2VNE8aGYuhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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