SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f1a0f0decb85c585ec9a719ae606b45ba161a95b22bc7e3c6182fa38af4520fc' 
  AND token = 'JJEMiwQsZ83QxPYvhjzojBDSFuybS6M/OVPH+f7NuKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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