Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '268170c77215d62c2f788b85f033ba6e5a3c7f83deaf0e0559c0276fa4aeb020' 
  AND token = 'Qx67W9vmeSR+33Bf/bojoCWif8zfoYg+DceaLloCgtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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