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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9f10d90322bf42adcd8486e81c579ad88a50d640b6f75960b422e7b932f5426c' 
  AND token = 'aACxmD9h/mhlHPPmiCSeayYKe77dq3rF2pzKNWlBrLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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