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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cc8133396150de95b5d452323e93d05a2761457b54adc686a83722c4ad0f6d33' 
  AND token = 'DjtKu2If3gyTwJ0neAeUaowXD5G0dOdFEUqZo9rrxBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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