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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6707f802eeb4709dc53fc5ee2173e480c654fe36b362f506e8d7880f5f23f40f' 
  AND token = 'wwFTsdVA3zmdp93c3Vvqw7/tgPnAl0vMpxYNuo1UMvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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