Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '768aa2f032d6cd12c45b2414dec1e541fc0984f48ec7a562e41f7cb1bfc296e6' 
  AND token = 'i30zlqgpogt3c1aLTEG9cltjHUHt58jdv276M24rlDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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