Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d0df4c487fc607ed8cf8bd54dc7cc6da5e423d7d5faf59447f43659f8a5c96' 
  AND token = 'xmLoEf+pfo3NoMWdpe3bI/1DyrpGRNKLcSbaDJGGkQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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