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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4bbcda70cb7ec29dcf78f06b35580ac19f80c92c1eccb788f75f69eedf85b441' 
  AND token = 'Ygn3KyQG1wkQIRV/p1iazt7fq3BbbA7SLLO12clfBSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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