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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '33053567200f7bd5a8240f6168b604e5d245ab7c6d3f2b5e66a4549e058bebfd' 
  AND token = 'ipA325ViGuiuHTLC8rOdtQwAXCD1PVMMe6liSWnSe78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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