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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1588131b2efef0e114dec4a4db773537f312c7ad89d5523d253f95bf5c78ebd5' 
  AND token = 'wOJsjI2nVYNNSxi5GCetIvAGXpOTiS46OrHA/et7yJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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