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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '23f23c213ae945ea47d8048c95f4fb44e5a164512b8a577bc3db826caf7c05ce' 
  AND token = 'pWupu1skd0eT3z0fBQsBgJ6/2rFaie+X+DJXXM+B9ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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