Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd202190606b0be93a4cbfe6d50ddd322367ba75ab9fb518bc6a357cb28028c0' 
  AND token = 'SMXO3rTWASm9LmyK6m95bwdlg+v/4kVEcfpSbKMIk8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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