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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '52ef53690aca65dbd8b50563668d439fdcb22c4e2cf90c9c39af712dc7e3c7d3' 
  AND token = 'NxS5WPUNd8Q3BUS6fccrtcc1ftDGbWoVXvoromiaI9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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