Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acfa5fdbd9d34efa3ec3eda5b7759eb79f1214e680de67f7feee32686d16bf9a' 
  AND token = 'PDnyVPgeCcGnNvjnnVln0JM/CyrcSqWSffmSj5/zZdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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