SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7956562f0faa49c66015fa6381d71aefe7f54909214f8ea9c5af0666be173174' 
  AND token = '+i1FJ5HVZB/2RhDGk4WbhsF0JvEtKzctEoZemsWLo70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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