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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '157b74b8cd740aa43e9138346620f932ad985a59662f1b5492925fec5fef5326' 
  AND token = 'Oo1aK2B/icxvTtQCHK3g5u0O9qy7u4/cEBFYt39khac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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