Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '76d8b95b6344b987ad98e3be483d6c5849d3e8edd2edd35929cb661e452c56e5' 
  AND token = 'nS+LwaP2LvwW4g6ET1Xzg/HfJ7K/fNUAn4IJaOLI/rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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