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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '23bafaa3f07604b1e0082f1ee201611e5d506ae11c674ac144d7d05e3e6189e2' 
  AND token = 'zJKoODsGTEnrMiMsK1G8XGNKxxe/6ShDg9EeJddu/xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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