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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bed9289e4ebbb279dc2b2f24377afaadd77ef8f606d92e0b2d11afdd2855137c' 
  AND token = 'r3/czNRwG138W3abU8ZblR70oWmfY5YPU0xGa2Xr0uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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