Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4dc3c5dd77e12ab56b9819664b66e6a43a931f310ea7754ce08e3ffb59ca3d3' 
  AND token = 'm5o/jAiLQFEnJ1YEB1tTxZHxZa6CDjMvwcmOMOhi5f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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