Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '564b003cfee495ecc2a8603d51433897bbcbbbc19a0bc5e9ecf0b1bce9ad7933' 
  AND token = 'MZkrcDr04JhUeaF77MhH8uzAA4oK+QuDuWocZgApokg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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