Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bcc53e2ec3fcc1b6988bac007936932341ad98ea8ae8f82bb8e4cccda9e3ebb1' 
  AND token = 'RdaSSv0KlfIwCz3r9+ZN3Eg50c1Sh7wGJA/kv+8f5l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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