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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '98e30e1ecb1d6625711837edb0a42806332632f7e763372f1f3e8cda8eb540ad' 
  AND token = 'nkl1CthiCAlASscnta/uBOBc03J4kGRqZusV5Mj1KDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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