Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a9e9010675841d56a522019990a7f2899c2e69486e14f99ca0549218fd46c6d' 
  AND token = 'tzATgXFYHGya2NZTfvawP+u+2kO38oVqpxBhFPO6l+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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