SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '58993c8b20592fe66f1224a03c038de799dc6f05823484c466fb10bccf7741e9' 
  AND token = 'soVSerzQGhi/yZMtY9AosK3loPpLizVVAbOkl3FSSno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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