Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '376704ec4c12bf1ff4ea40b7ac5b949616be6abcc151b33df82615173091a569' 
  AND token = 'YskFKJnDAZAvyfXS+Y//Ofg5NxEZxKGvI7DynNdZcbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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