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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9224f43bf567e94af9d337c1a1fe30430408dcfb1dd4bafbdc783d17c58615bc' 
  AND token = '91KE1R8Sw2JkTbmHC2VyZXfdhLgw+E1YwVfDpnfBAfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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