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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '664edd695ab42145395bab64e8ab30148c4017b2dc8b7bdd8e4076ef0724d378' 
  AND token = 'jWgQVy/xqdlKILZPPdbE8itbtK1uOznv0VAITFg/2W4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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