Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b6b8f36f63d745108aa8e7f1bf18e7049ba272feab559557bbd2cb0b638e015' 
  AND token = 'I1cn6VcICRdNOCI/MRgAtFIdIqKrNA4uagBic/Y3+No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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