Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a889762528ad7b34fa06bdb7d1e5fb48570b3b1424f7393820b30e64bb98ae3' 
  AND token = 'nsBcKQkL79KngSijd6qU+WRCPjLEYo0ToP+/368srBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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