SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4684ff38ef059b4a538c11a8b91106790ad91915c65e4a86b7842ed1e91aac6e' 
  AND token = 'TGe5q7xEgVkQpCazO7+6nI/LeZVGBfoyTMgVQLrkPmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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