Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076c387d37280607254befbbefd807a99c03df17433268d10a389367e295af54' 
  AND token = 'RuJBA4quwY94fbAc0bQ2yOKgQqqszgrXDsRWcrm/2u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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