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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9205f2a15bc2db2546632925dff57080e80d15528e45a9064aed048f040047b7' 
  AND token = 'rL7tw0WiSj8cYcFadBUiUOn2ZWbCT/r1k7xLXyjvFhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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